The SignalTech 4" Round and 6" Oval LED lights were developed around emergency vehicle specifications. When flashing, these LED lights meet SAE J595 and CAC Title 13 specifications. As Stop/Tail/Turn and back-up/turn these LEDs meet FMVSS 108, SAE J1398 and SAE J593 specifications. The reflector cell technology enhances the brightness of this exterior LED lights even in full sunlight. Unlike other LED lights, these SignalTech lights have an enhanced lens design for a uniform light pattern. The SignalTech lights are designed for the vehicles rugged conditions with "potted", solid state components to protect against shock and vibration and impact-resistant housing to protect against moisture and contaminates.